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  <title>使用反斜线引用字符串</title>
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  <div id="layout-content"><div id="function.addslashes" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">addslashes</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">addslashes</span> &mdash; <span class="dc-title">使用反斜线引用字符串</span></p>

 </div>
 
  <div class="refsect1 description" id="refsect1-function.addslashes-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>addslashes</strong></span>(<span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>): <span class="type">string</span></div>

  <p class="para rdfs-comment">
   返回需要在转义字符之前添加反斜线的字符串。这些字符是：
   <ul class="simplelist">
    <li class="member">单引号（<code class="literal">&#039;</code>）</li>
    <li class="member">双引号（<code class="literal">&quot;</code>）</li>
    <li class="member">反斜线（<code class="literal">\</code>）</li>
    <li class="member">NUL（NUL 字节）</li>
   </ul>
  </p>
  <p class="para">
   <span class="function"><strong>addslashes()</strong></span> 的一个用法就是转义由 PHP 执行字符串中的上述字符：
   <div class="informalexample">
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$str&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"O'Reilly?"</span><span style="color: #007700">;<br />eval(</span><span style="color: #DD0000">"echo&nbsp;'"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">addslashes</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"';"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
  <p class="para">
   有时会错误的使用 <span class="function"><strong>addslashes()</strong></span> 来防止 <a href="security.database.sql-injection.html" class="link">SQL 注入</a>。相反，应该使用数据库特定函数和/或预处理语句。
  </p>
 </div>


  <div class="refsect1 parameters" id="refsect1-function.addslashes-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">string</code></dt>

     <dd>

      <p class="para">
       要转义的字符。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 
 
  <div class="refsect1 returnvalues" id="refsect1-function.addslashes-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回转义后的字符。
  </p>
 </div>

 
 <div class="refsect1 examples" id="refsect1-function.addslashes-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4749">
    <p><strong>示例 #1 一个 <span class="function"><strong>addslashes()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$str&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"Is&nbsp;your&nbsp;name&nbsp;O'Reilly?"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//&nbsp;输出：&nbsp;Is&nbsp;your&nbsp;name&nbsp;O\'Reilly?<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">addslashes</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.addslashes-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.stripcslashes.html" class="function" rel="rdfs-seeAlso">stripcslashes()</a> - 反引用一个使用 addcslashes 转义的字符串</span></li>
    <li class="member"><span class="function"><a href="function.stripslashes.html" class="function" rel="rdfs-seeAlso">stripslashes()</a> - 反引用一个引用字符串</span></li>
    <li class="member"><span class="function"><a href="function.addcslashes.html" class="function" rel="rdfs-seeAlso">addcslashes()</a> - 以 C 语言风格使用反斜线转义字符串中的字符</span></li>
    <li class="member"><span class="function"><a href="function.htmlspecialchars.html" class="function" rel="rdfs-seeAlso">htmlspecialchars()</a> - 将特殊字符转换为 HTML 实体</span></li>
    <li class="member"><span class="function"><a href="function.quotemeta.html" class="function" rel="rdfs-seeAlso">quotemeta()</a> - 转义元字符集</span></li>
    <li class="member"><span class="function"><a href="function.get-magic-quotes-gpc.html" class="function" rel="rdfs-seeAlso">get_magic_quotes_gpc()</a> - 获取当前 magic_quotes_gpc 的配置选项设置</span></li>
   </ul>
  </p>
 </div>

 
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